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As an important transportation phenomenon, Bloch oscillations have been studied extensively in Hermitian systems. Here by exploiting the concept of parity-time symmetry, we experimentally realize for the first time Bloch oscillations in a non-Hermitian silicon photonic lattice and show that such system contains intriguing physics.
We have designed, fabricated, and tested a CMOS compatible silicon waveguide system that demonstrates nonreciprocal light propagation on-chip, by mimicking microscopic non-Hermitian optical potentials for guided light and thus spontaneously breaking parity-time symmetry. Experiments were performed at 1.55 µm wavelength for potential telecommunication applications.
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